Ok, I got to thinking the today. I have two boys and they totally different ways of answering questions they don't understand.
One is a Yes Boy. Ask him any question that he doesn't understand and he will say Yes! It's not something that comes and goes, he's been answering the same way from as far back as he could nod his head to answer.
My younger son is a No boy. Ask him any question he doesn't understand and he will say no. He's been doing it ever since he could no his head to give an answer.
I know that it's not just confined to my boys, so now a question to the parents, is your kid a no kid, a yes kid or does your kid just do the appropriate I don't know shrug?
Don't ask questions when you fear the answers --Paulo Coelho